Carburetor



Dec. 1, 1925. 1,563,339 1 M. G. CHANDLER CARBURETOR Filed oct. 14. 1922Wegm" IHIII! Patented Dec. 1, 1925.`

UNITE-D STATES l 1,563,339 PATENT OFFICE. f,

MILFORD G. CHANDLER, F CHICAGO, ILLINOIS, ASSIGNOR, BY MmNEASSIGNIIES'TS, i i

`T0 CURTIS B. CAMP, TRUSTEE, OE OAX PARK, ILLINOIS- CBBURETOR. l

Application led October 14, 1922. Serial No. 594,523.

My `invention relates to carburetors ofy the type which have provisionfor rasing fuel from a low level supply tank tothe level of thecarburetor by suction obtained 1I from lthe engine to which thecarburetor is attached. y

.Certain features of my invention are ap.

plicable to carburetors of the type adalpted to receive their fuel bygravity How rom a tank at a higher level. Other features are applicableonly to carburetors of the type in which the suction available withinthe mix-y ing chamber or the intake manifold is augmented for liftingfuel from -a low level sup ly to the level of the carburetor.

e advantages to be gained byl an augmented suction are fully set forthin my Patent No. 1,370,947, datedMarch -8, 1921, and such advantages,therefore, need not be restated here. l

A feature of my invention, and one which is applicable to oth gravityand vacuum fed carburetors, resides in the arrangement for deliveringfuel to the .float chamber through a .centrally located tubular screencarried by a removable plug, the chamber for the screen or filter orminga column through the central part of tliefloatv cham- -ber b means ofwhich the bowl of the float chamber cover. y A further feature of mymvention, and one which is ap licable to both gravityand vacuum fed caruretors, resides in the concham er may be readily attached tothe floatMy invention is illustrated in the accompanying drawings, in which Y.Figure 1 is a section through the induction passage and the oat chamber,the latter being .shown connected with a low= level source of fuelsupply;

Figure 2 is an elevation; and

Flgure 3 is a section through the float valveseat, taken on the line 3 3of Figure 1.

In the preferred embodiment of my inyention,` Ithe float chamber. cover4 is cast integrally with the main housing 5, thus providing astructure` through which the various air and fuel passages may be con-'veniently formd. Dependin from the iioat chamber cover is an integratubular illar or hollow column 6 carrying a latera pro'- Jection 7 towhich the float 8 is pivoted at 9. A valve member 10 has a Workingitwithin. a cylindrical bore or guide opening through a part of thelateral member 7 and' has a conical point 11 which forms a valve forclosing the openi 12 leading from the transverse bore 13 which connectswith, the hollow portion of the stem 6 into the milled slot 14. Thefloat chamber bowl 16 is clamped against the cover 4 by means of 'themember 18, which 'is threaded into the hollow portion of theY lowerv endof the pillar 6. A tubular 'filter screen 19 is' carried upon a threadedplug 20, which is l screwed into the member 18, thus providing readymeans for removing the screen for cleaning out sediment. Fuel deliveryconnectlon to the oat chamber is made through a fitting 21 threaded intoan opening in the cover 4. i

The tloat chamber parts thus described operate in the lusual manner tomaintain a substantially constant fuel level in the float chamber,whether fuel is fed thereto by gravity or by suction. Valve 10, beingcylindrical instead of triangular or slotted as is customary, presents a-larger wearing surface to the y 'din opening in the projection 7 than`1s obtamed with theusual construction, thus preven leakage due tocoeking of the valve, which is a source of trouble in many carburetors.

The construction of the carbureting a paratus embodied in thecarburetory 5 has been described and claimed in my copending a plicationSerial No. 736,258,

filed Septem r 6, 1924, this latter applica. p

aov

tion being divisional of the present application. e'

A vacuum Venturi tube 48 is fitted into an opening in the housing 5, sothat its y discharge end lies. adjacent the outer surfaces o the valvemember which `controls the main air entrance to the carbureting'chamber. As described in my copending application, this valve member iscontoured so as to variably obstruct the discharge end of the Venturitube 48 for differentpositions of the valve member controlling the mainair entrance. The throat of the Venturi tube 48 is connected through apassage 49 with the upper part of the float chamber for'the purpose ofcreating a suction in the float chamber for drawing fuel thereto from alow level source of supply. The opening at the throat of the vacuumVenturi tube -48 is preferably made very small, its only function beingto admit sulicent air to create an augmented suction in the floatlchamber.

The flow of air through the Venturi tube 48 creates a suction upon thesurface of the fuel in the float chamber. This suction being augmentedby the Venturi tube 48 is about twice as great as that existing in thebody of the carburetor at the opposite end of the Venturi tube 48. Thissuction is available for lifting fuel from the low` level supply tank tothev float chamber of the carburetor, but, as described in my copendingap lication,

this suction is of lesser degree t an that prevailing at the nozzleopenings, whereby the feed of fuel to the nozzle openings-is alwaysassured.V f

It will be understood. that many features4 of the invention hereindescribed are applicable to carburetors of the 'gravity feed type,though some of the features are applica le only to carburetors of thesuction feed type.

carburetor into one of the gravity feed type,

vit is necessar only that air be admitted to the -lioat c amer toprevent the suction therein from rising to as high proportions as-whenthe carburetor is used for suction delivery of fuel to the bowl.

While I have shown and described Vmy invention with res ect to certaindetails, it is to be understoo that these may be modified in manyrespects without departing from the ls irit or scope of my invention;

` What Ipcaim isz" f 1.-.InA a carburetor, the combination with 'aninduction passage of a float chamber comprising fa 0 said. inductionpassage, a

extending downwardly from the cover of said float chamber, a memberadapted to be attache'd tothe bottom of the hollow column and having an,abutment thereon forholdingthe 'bowl against the cover, a plug car- Inorder to4 convert thisV owl for lsuppl ing fuel to' i o ow columnLacasse riedby said member, 'a tubular screen exopening in communicationwith the hollow Y column outside the said screen, a valve `forcontrolling said opening, a pivoted float for controlling said valve,and afuel delivery connection through the said float chamber coverdelivering inside the said tubular screen. l

2. A float ,chamber for cai'buretors comprising va cover having atubular pillar eX- tending downwardly therefrom, a bowl, a memberextending through a central opening in said bowl and attached to thelower end of said tubular pillar for holding the Abowl against thecover, a tubular screen within the tubular pillar removable through saidmember, and a fuel delivery port through said float chamber coverdelivering within the said tubular screen 3. A float chamber forcarburetors and the like comprising a cover, a bowl, a column extendingdownwardly fromv said cover into said bowl, screw-threaded meansassociated with said bowl for connecting to thelower end of said columnfor connecting said bowl and said cover together, a fuel inletpassageway in said column opening through the top of said cover, a bossextending laterally from said column, a lateral fuel passageway in saidboss communieating with said fuel inlet passageway, a fuel port openingfrom said lateral fuel passageway into said bowl, a fuel valvecontrolling said port, and a float pivotally supported on said boss foractuating said valve. 4. A float chamber for carburetors and the likecomprising a cover, a bowl, a hollow `column extending between the coverand the base of the bowl and lattached to leach for holding the bowl andcover together, a tubular screen within said hollow column, a fueldelivery port for delivering fuel within said lscreen and afloat-controlled port betweenthe hollow column and the interior of thefloat chamber bowl, and aA float for y controlling saidport.

5. A, float chamber the like comprising a cover, a bowl, a hollow columnextending between the cover and the base of the bowl for attaching thebowl and coverto ether, means for `delivering fuel into said ollowcolumn, a port between the hollow `column and the float chamber bowl, aguided valve member controlling said port, a lateral passageway locatedbetween the said port and the guide for said glilnded valve memberk forthe discharge of el from said .port into the float chamber,

land a float controlling said guided valve member.

6. A float chamber for carburetors and the like comprisin a cover, abowl, a co1- umn 'extending ownwardly from said for carburetors 4andcover into said bowl, a fuel inlet passageway fuel valve controllingsaid port, and a Hoat in said column opening through the to of pivotallysupported on said boss for actuatsaid cover, a boss ext-ending laterallyrom ing said valve. 10 .said column, a lateral fuel passageway in Inwitness whereof, .I hereunto subscribe 5 said boss communicating withsaid fuel inlet my name this 3rd day of October, 1922.

passageway, a fuel port opening from said lateral fuel passageway intosaid bowl, a MILFORD Gr. CHANDLER.

